Better OP-07 type for audio?

Jules Ryckebusch ryckebu at ersg.san.mrms.navy.mil
Tue Mar 28 17:48:44 CEST 2000


There are a couple of good choices, try the OPA134 family from Burr Brown.
The problem is offset vs other specs for audio ie  speed/distortion. The
OPA134's are only rated 500uV offset and the OP07 is better but much slower.
You could always use the hi speed audio one then use a precision offset one
to servo the audio one. IMHO offset isn't that much of a problem unless you
take the 500 microvolts and throw it into a situation with a lot of DC gain.
BTW The OPA134's are available from Digi-Key, which is the other half of the
opamp problem, where to get them!

Jules Ryckebusch

Buck Buchanan wrote:

> Hi all,
>
> harrybissell at prodigy.net wrote:
> > OP-07 is OLD OLD OLD...
> > and
> > SLOW SLOW SLOW... Its really no better for audio than
> > the 741, of which it is a greatly improved version...
> >
> > Use when you need very low offset voltage and fairly low
> > bias current... and speed of .3V/uS
> >
> > Don't use for audio.
>
> In situations where offset trimming to <100uV doesn't improve much if
> anything (say, driving an SSM2164), the OP-07 has been handy for use w/o
> trimmers.  But apprarently that was a boo boo (woops - better go look at
> that module a little harder and see how well it's *really* working).
>
> Any suggestion on op-amps with same offset specs as the OP-07 but
> suitable for audio?  Spoze if they get too expensive though it's back to
> trimmers....
>
> Thanks mucho,
>
> Buck




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